Immigration has always been important to the USA. It is a shame we are having less children, but all developed societies end up this way. There is not enough support in the system to have many kids like in the past.
Well, from what I've seen in the US. Many Mexicans move to the US and live with extended families, so a typical 5room house can easily accommodate that. But the next generation of those children aren't going to want to live in extended homes. They'll want to have their own place and this has economical effects like having less children. Economics plays a huge role to if people will have children too. Afterall, we're not obligated to bare children.
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In general, they are catholic. They will keep having children. Maybe after a few generations, they will stop having as many.
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